working of eye

Working of an Eye - The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retina. The light sensitive cells of the retina gets activated with the i..

The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retin..

The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retina. The light sensitive cells of the retina gets activated with the incidence of light and generate electric ..

The ray diagram given below gives the principle of a compound microscope. The object is mounted on the stand below the microscope tube. The objective lens forms a real, inverted and magnified image (I 1 ) of the object. The image I 1 acts as an object for the eye piece. The position of th..

A Microscope You need to get acquainted with the usage of the microscope, for observing cells. On the screen is the figure of a light microscope. Study the parts and learn their names. The specimen to be observed is placed on a glass slide on the stage under an objective piece, in the middle o..

Conclusion - Thus, this chapter on refraction helps us understand many natural phenomena like the twinkling of stars, the sparkling of diamonds, mirage etc. It also throws light on the working of the human eye and the defects of visi..

Microsurgery is any operation done with the aid of microscopes. Surgeons work with spectacle - mounted magnifiers or with microscopes. Using this technique, surgeons can remove adenoma, tumours of the pituitary gland, without damaging the gland itself. Neurosurgeons, ear and ey..

The eye works on the same principle as that of the camera. The light rays from the object pass through the conjuctiva, cornea, aqueous humour, lens and vitreous humour in that order. All these structures refract the light such that it falls on the retina. This is called focussin..

Microsurgery is any operation done with the aid of microscopes. Surgeons work with spectacle - mounted magnifiers or with microscopes. Using this technique, surgeons can remove adenoma, tumours of the pituitary gland, without damaging the gland itself. Neurosurgeons, ear and eye..

Apart from hearing impairment, the first effects are anxiety and stress reaction and in extreme cases fright . The physiological manifestations are : Increase in the rate of heart-beat, increased cholesterol and blood pressure. Constriction of blood vessels Digestive spasms and stomach ..